PROCEEDINGS 



OF THE 



American Philosophical Society 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 

 Vol. LVIII. 1919. No. 1. 



CONTENTS 



PAGE 



The Parasitic Aculeata, A Study in Evolution. B}- William Morton 



Wheeler .......... i 



The Relation of the Diet to Pellagra. By E. V. McCollum . . 41 



Evolution and Mystery in the Discovery of America. By Edwix Swift 



Balch ........... 55 



Tatar Material in Old Russian. By J. Dyneley Prince . . 74 



The Energy Loss of Young Women during the Muscular Activity of Light 



Household Work. By Francis G. Benedict and Alice Johnson 89 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 

 104 South Fifth Street 



1919 



